I was going to try that Carbon KK ROM for Xperia Sola, but I got an installation aborted error, saying something about "assert failed", as if I my device wasn't MT27i
So sadly, can't say much about it lol

I tried CM11 by Munjeni and i found it quite good, the battery life is like a gingerbread stock, the performance are good except some bugs very annoying ad example sometimes the back button didn't work and i think that in build9 the omx isn't really fixed at all...
I found the build8 more smooth than build9 but it hasn't the OMX, you have to install mxplayer and for youtube videos use dolphin with flashplayer

I don't want to offend the great developers of these roms, i like too much their work for our device

I was going to try that Carbon KK ROM for Xperia Sola, but I got an installation aborted error, saying something about "assert failed", as if I my device wasn't MT27i
So sadly, can't say much about it lol

did u flash the corresponding kernel for that rom prior to trying to install it?
if this does not solve the error, you can remove the assertions from the zip-file
go to meta-inf/com/google/android/updater-script and remove the lines containing the assertions and make sure to save the modified file back into the ziphowever, this can be extremely dangerous; do it at your own risk

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